中文摘要：

电场防护是带电作业安全技术研究的重要内容,关系到作业人员的生命安全。文中分析了500 k V紧凑型同塔双回输电线路的结构特点,建立了作业人员体表场强仿真模型,计算了典型工况下不同作业点人员的体表场强分布,同时分析了塔型和线路运行方式对人员体表场强分布的影响。计算结果表明：同一运行方式下,地电位作业时,直线塔作业人员的头部和脚部场强较耐张塔高出约4倍;等电位作业时,耐张塔作业人员的头部场强较直线塔高243.2 k V/m,手部较之高出1.9倍。同一塔型作业时,相同工况下两回运行相比于一回运行对等电位作业影响较大;地电位仅中间横担处人员体表场强受运行方式影响明显。通过屏蔽效率的计算,校核了不同工况以及不同作业点应采取的安全防护措施。研究结果可以为带电作业的安全防护工作提供理论参考,具有一定的工程实用价值。

英文摘要：

The electric field protection is an important part of live working security technology research, which re- lated to the workers＇ safety. This article purposefully analyzes the structural characteristics of compact 500 kV same tower double circuit transmission lines, establishes the simulation model of body surface field strength, and calcu- lates the body surface field strength of different operating points under typical conditions. At the same time, it ana- lyzes the influence of the tower type and line operation mode on body surface field strength distribution. The results show that： under the same operating mode, when working at ground potential, the head and foot field strengths of the personnel working in the linear tower are about 4 times higher than those in the strain towers; When working in equipotential, the head field strength on the strain towers is 243.2 kV/m higher than that in the linear towers, and hand field strength is 1.9 times higher than that in the linear towers. When working in the same tower, compared with one circuit operation mode, two circuit operation modes under the same conditions has a stronger influence on the equipotential operation; When working in ground potential, the influence of the operation mode on the body sur- face field strength on the cross arm is obvious. Through the calculation of shielding efficiency, the safety protection measures under different working conditions and different operation points are checked. The research results can provide theoretical reference for safety protection of live working, and have certain practical value in engineering.